y varies jointly as x and the cube of z and inversely as the square root of w. When x=1, z=2 and w=64, then y=3. Find y when x=4, z=1 and w=144.   y=_________

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A: Please refer to the image below

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A: If ~v = 〈 4, 1, 6〉 and ~w = 〈3, 2, 3〉, find ~v · ~w and ~v × ~w.

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